Sorry I'm not sure if the cylinder was made in house but can find out if ya like. should have given a little info on gun it started out as a 45 colt has a 5 1/2" barrel, longer ejector rod housing studed,checkered ejector rod button,knurled,locking,oversized basepin,fitted cylinderstop,Jim Stroh front sight base,extra power basepin spring,trigger return spring,Andy scalloped the rear sight ears and Doug Turnbull color casehardening waiting for Bowen rear sight.